The open A tuning for guitar is an alternative tuning for guitar where the six open strings of the guitar (lowest to highest) are tuned to the following notes: E, A, C#, E, A, E.
Open A tuning is called so as the notes A, C#, E are the notes of the A major chord and thus the A major chord can be played using open strings only.
The most common guitar tuning is EADGBE (lowest to highest). One can obtain the open A tuning from the standard tuning by: 1) dropping the fourth string (highest to lowest) one semitone from D to C#; 2) dropping the third string three semitones from G to E; and 3) dropping the second guitar string two semitones from B to A.
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